feat: add pool cache adapter and strict event validation

- Created PoolCacheAdapter to wrap PoolDiscovery for EventParser
- Updated ArbitrumMonitor to pass pool cache to parser via NewEventParserFull
- Added strict validation to reject events with zero addresses
- Added strict validation to reject events with zero amounts
- Parser now uses discovered pools from cache for token enrichment

This ensures zero addresses and zero amounts NEVER reach the scanner.
Events with invalid data are logged and rejected at the monitor level.

Changes:
- pkg/pools/pool_cache_adapter.go: New adapter implementing PoolCache interface
- pkg/monitor/concurrent.go: Pool cache integration and validation logic

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

pkg/monitor/concurrent.go

@@ -144,21 +144,7 @@ func NewArbitrumMonitor(
 		return nil, fmt.Errorf("L2 parser is null, cannot create enhanced event parser")
 	}
 
-	logger.Info("✅ L2 PARSER AVAILABLE - Creating enhanced event parser...")
-	enhancedEventParser := events.NewEventParserWithTokenExtractor(logger, l2Parser)
-
-	if enhancedEventParser == nil {
-		logger.Error("❌ ENHANCED EVENT PARSER CREATION FAILED")
-		return nil, fmt.Errorf("enhanced event parser creation failed")
-	}
-
-	logger.Info("✅ ENHANCED EVENT PARSER CREATED SUCCESSFULLY")
-	logger.Info("🔄 INJECTING ENHANCED PARSER INTO PIPELINE...")
-
-	// Inject enhanced parser into pipeline to avoid import cycle
-	pipeline.SetEnhancedEventParser(enhancedEventParser)
-
-	logger.Info("🎯 ENHANCED PARSER INJECTION COMPLETED")
+	logger.Info("✅ L2 PARSER AVAILABLE - Creating pool discovery for cache...")
 
 	// Create raw RPC client for pool discovery
 	poolRPCClient, err := rpc.Dial(arbCfg.RPCEndpoint)
@@ -166,7 +152,29 @@ func NewArbitrumMonitor(
 		return nil, fmt.Errorf("failed to create RPC client for pool discovery: %w", err)
 	}
 
-	_ = pools.NewPoolDiscovery(poolRPCClient, logger) // Will be used in future enhancements
+	// Create pool discovery for caching discovered pools
+	poolDiscovery := pools.NewPoolDiscovery(poolRPCClient, logger)
+
+	// Create pool cache adapter to provide PoolCache interface
+	poolCacheAdapter := pools.NewPoolCacheAdapter(poolDiscovery)
+
+	logger.Info("✅ POOL CACHE ADAPTER CREATED - Creating enhanced event parser...")
+
+	// Create enhanced event parser with pool cache support
+	enhancedEventParser := events.NewEventParserFull(logger, l2Parser, poolCacheAdapter)
+
+	if enhancedEventParser == nil {
+		logger.Error("❌ ENHANCED EVENT PARSER CREATION FAILED")
+		return nil, fmt.Errorf("enhanced event parser creation failed")
+	}
+
+	logger.Info("✅ ENHANCED EVENT PARSER CREATED SUCCESSFULLY WITH POOL CACHE")
+	logger.Info("🔄 INJECTING ENHANCED PARSER INTO PIPELINE...")
+
+	// Inject enhanced parser into pipeline to avoid import cycle
+	pipeline.SetEnhancedEventParser(enhancedEventParser)
+
+	logger.Info("🎯 ENHANCED PARSER INJECTION COMPLETED")
 
 	// Create MEV coordinator - removed to avoid import cycle
 	// coordinator := orchestrator.NewMEVCoordinator(
@@ -830,10 +838,50 @@ func (m *ArbitrumMonitor) processTransactionReceipt(ctx context.Context, receipt
 
 		m.logger.Info(fmt.Sprintf("Successfully parsed %d events from receipt %s", len(parsedEvents), receipt.TxHash.Hex()))
 
-		// Submit each parsed event directly to the scanner
+		// Submit each parsed event directly to the scanner with strict validation
 		for _, event := range parsedEvents {
 			if event != nil {
-				m.logger.Debug(fmt.Sprintf("Submitting event to scanner: Type=%s, Pool=%s, Token0=%s, Token1=%s",
+				// CRITICAL: Validate event data quality before submission
+				// Zero addresses and zero amounts are NEVER acceptable
+				isValid := true
+				validationErrors := []string{}
+
+				// Check for zero addresses
+				zeroAddr := common.Address{}
+				if event.Token0 == zeroAddr {
+					validationErrors = append(validationErrors, "Token0 is zero address")
+					isValid = false
+				}
+				if event.Token1 == zeroAddr {
+					validationErrors = append(validationErrors, "Token1 is zero address")
+					isValid = false
+				}
+				if event.PoolAddress == zeroAddr {
+					validationErrors = append(validationErrors, "PoolAddress is zero address")
+					isValid = false
+				}
+
+				// Check for zero amounts (for swap events)
+				if event.Type == events.EventTypeSwap {
+					if event.Amount0In != nil && event.Amount0In.Sign() == 0 &&
+						event.Amount0Out != nil && event.Amount0Out.Sign() == 0 {
+						validationErrors = append(validationErrors, "Amount0In and Amount0Out are both zero")
+						isValid = false
+					}
+					if event.Amount1In != nil && event.Amount1In.Sign() == 0 &&
+						event.Amount1Out != nil && event.Amount1Out.Sign() == 0 {
+						validationErrors = append(validationErrors, "Amount1In and Amount1Out are both zero")
+						isValid = false
+					}
+				}
+
+				if !isValid {
+					m.logger.Warn(fmt.Sprintf("❌ REJECTING INVALID EVENT - Type=%s, Pool=%s, TxHash=%s, Errors: %v",
+						event.Type.String(), event.PoolAddress.Hex(), event.TxHash.Hex(), validationErrors))
+					continue
+				}
+
+				m.logger.Debug(fmt.Sprintf("✅ Valid event - Submitting to scanner: Type=%s, Pool=%s, Token0=%s, Token1=%s",
 					event.Type.String(), event.PoolAddress.Hex(), event.Token0.Hex(), event.Token1.Hex()))
 
 				// Submit to scanner for arbitrage analysis